u8 *xfer_mode_out,
unsigned int *xfer_shift_out);
static void __ata_qc_complete(struct ata_queued_cmd *qc);
+static void ata_pio_error(struct ata_port *ap);
static unsigned int ata_unique_id = 1;
static struct workqueue_struct *ata_wq;
}
+ if (dev->id[59] & 0x100) {
+ dev->multi_count = dev->id[59] & 0xff;
+ DPRINTK("ata%u: dev %u multi count %u\n",
+ ap->id, device, dev->multi_count);
+ }
+
ap->host->max_cmd_len = 16;
}
ap->cdb_len = (unsigned int) rc;
ap->host->max_cmd_len = (unsigned char) ap->cdb_len;
+ if (ata_id_cdb_intr(dev->id))
+ dev->flags |= ATA_DFLAG_CDB_INTR;
+
/* print device info to dmesg */
printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
ap->id, device,
unsigned long flags;
spin_lock_irqsave(&ap->host_set->lock, flags);
- ap->flags &= ~ATA_FLAG_NOINTR;
ata_irq_on(ap);
ata_qc_complete(qc);
spin_unlock_irqrestore(&ap->host_set->lock, flags);
* None. (executing in kernel thread context)
*
* RETURNS:
- * Non-zero if qc completed, zero otherwise.
+ * Zero if qc completed.
+ * Non-zero if has next.
*/
static int ata_pio_complete (struct ata_port *ap)
* we enter, BSY will be cleared in a chk-status or two. If not,
* the drive is probably seeking or something. Snooze for a couple
* msecs, then chk-status again. If still busy, fall back to
- * HSM_ST_POLL state.
+ * HSM_ST_LAST_POLL state.
*/
drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
if (drv_stat & ATA_BUSY) {
if (drv_stat & ATA_BUSY) {
ap->hsm_task_state = HSM_ST_LAST_POLL;
ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
- return 0;
+ return 1;
}
}
if (!ata_ok(drv_stat)) {
qc->err_mask |= __ac_err_mask(drv_stat);
ap->hsm_task_state = HSM_ST_ERR;
- return 0;
+ return 1;
}
ap->hsm_task_state = HSM_ST_IDLE;
/* another command may start at this point */
- return 1;
+ return 0;
}
page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE;
- buf = kmap(page) + offset;
+ DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+
+ if (PageHighMem(page)) {
+ unsigned long flags;
+
+ local_irq_save(flags);
+ buf = kmap_atomic(page, KM_IRQ0);
+
+ /* do the actual data transfer */
+ ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
+
+ kunmap_atomic(buf, KM_IRQ0);
+ local_irq_restore(flags);
+ } else {
+ buf = page_address(page);
+ ata_data_xfer(ap, buf + offset, ATA_SECT_SIZE, do_write);
+ }
qc->cursect++;
qc->cursg_ofs++;
qc->cursg++;
qc->cursg_ofs = 0;
}
+}
- DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+/**
+ * ata_pio_sectors - Transfer one or many 512-byte sectors.
+ * @qc: Command on going
+ *
+ * Transfer one or many ATA_SECT_SIZE of data from/to the
+ * ATA device for the DRQ request.
+ *
+ * LOCKING:
+ * Inherited from caller.
+ */
+
+static void ata_pio_sectors(struct ata_queued_cmd *qc)
+{
+ if (is_multi_taskfile(&qc->tf)) {
+ /* READ/WRITE MULTIPLE */
+ unsigned int nsect;
+
+ assert(qc->dev->multi_count);
+
+ nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
+ while (nsect--)
+ ata_pio_sector(qc);
+ } else
+ ata_pio_sector(qc);
+}
+
+/**
+ * atapi_send_cdb - Write CDB bytes to hardware
+ * @ap: Port to which ATAPI device is attached.
+ * @qc: Taskfile currently active
+ *
+ * When device has indicated its readiness to accept
+ * a CDB, this function is called. Send the CDB.
+ *
+ * LOCKING:
+ * caller.
+ */
+
+static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
+{
+ /* send SCSI cdb */
+ DPRINTK("send cdb\n");
+ assert(ap->cdb_len >= 12);
+
+ ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
+ ata_altstatus(ap); /* flush */
+
+ switch (qc->tf.protocol) {
+ case ATA_PROT_ATAPI:
+ ap->hsm_task_state = HSM_ST;
+ break;
+ case ATA_PROT_ATAPI_NODATA:
+ ap->hsm_task_state = HSM_ST_LAST;
+ break;
+ case ATA_PROT_ATAPI_DMA:
+ ap->hsm_task_state = HSM_ST_LAST;
+ /* initiate bmdma */
+ ap->ops->bmdma_start(qc);
+ break;
+ }
+}
+
+/**
+ * ata_pio_first_block - Write first data block to hardware
+ * @ap: Port to which ATA/ATAPI device is attached.
+ *
+ * When device has indicated its readiness to accept
+ * the data, this function sends out the CDB or
+ * the first data block by PIO.
+ * After this,
+ * - If polling, ata_pio_task() handles the rest.
+ * - Otherwise, interrupt handler takes over.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep)
+ *
+ * RETURNS:
+ * Zero if irq handler takes over
+ * Non-zero if has next (polling).
+ */
+
+static int ata_pio_first_block(struct ata_port *ap)
+{
+ struct ata_queued_cmd *qc;
+ u8 status;
+ unsigned long flags;
+ int has_next;
+
+ qc = ata_qc_from_tag(ap, ap->active_tag);
+ assert(qc != NULL);
+ assert(qc->flags & ATA_QCFLAG_ACTIVE);
+
+ /* if polling, we will stay in the work queue after sending the data.
+ * otherwise, interrupt handler takes over after sending the data.
+ */
+ has_next = (qc->tf.flags & ATA_TFLAG_POLLING);
+
+ /* sleep-wait for BSY to clear */
+ DPRINTK("busy wait\n");
+ if (ata_busy_sleep(ap, ATA_TMOUT_DATAOUT_QUICK, ATA_TMOUT_DATAOUT)) {
+ ap->hsm_task_state = HSM_ST_TMOUT;
+ goto err_out;
+ }
+
+ /* make sure DRQ is set */
+ status = ata_chk_status(ap);
+ if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
+ /* device status error */
+ ap->hsm_task_state = HSM_ST_ERR;
+ goto err_out;
+ }
+
+ /* Send the CDB (atapi) or the first data block (ata pio out).
+ * During the state transition, interrupt handler shouldn't
+ * be invoked before the data transfer is complete and
+ * hsm_task_state is changed. Hence, the following locking.
+ */
+ spin_lock_irqsave(&ap->host_set->lock, flags);
+
+ if (qc->tf.protocol == ATA_PROT_PIO) {
+ /* PIO data out protocol.
+ * send first data block.
+ */
+
+ /* ata_pio_sectors() might change the state to HSM_ST_LAST.
+ * so, the state is changed here before ata_pio_sectors().
+ */
+ ap->hsm_task_state = HSM_ST;
+ ata_pio_sectors(qc);
+ ata_altstatus(ap); /* flush */
+ } else
+ /* send CDB */
+ atapi_send_cdb(ap, qc);
+
+ spin_unlock_irqrestore(&ap->host_set->lock, flags);
- /* do the actual data transfer */
- do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
- ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);
+ /* if polling, ata_pio_task() handles the rest.
+ * otherwise, interrupt handler takes over from here.
+ */
+ return has_next;
- kunmap(page);
+err_out:
+ return 1; /* has next */
}
/**
/* don't cross page boundaries */
count = min(count, (unsigned int)PAGE_SIZE - offset);
- buf = kmap(page) + offset;
+ DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+
+ if (PageHighMem(page)) {
+ unsigned long flags;
+
+ local_irq_save(flags);
+ buf = kmap_atomic(page, KM_IRQ0);
+
+ /* do the actual data transfer */
+ ata_data_xfer(ap, buf + offset, count, do_write);
+
+ kunmap_atomic(buf, KM_IRQ0);
+ local_irq_restore(flags);
+ } else {
+ buf = page_address(page);
+ ata_data_xfer(ap, buf + offset, count, do_write);
+ }
bytes -= count;
qc->curbytes += count;
qc->cursg_ofs = 0;
}
- DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
-
- /* do the actual data transfer */
- ata_data_xfer(ap, buf, count, do_write);
-
- kunmap(page);
-
if (bytes)
goto next_sg;
}
if (do_write != i_write)
goto err_out;
+ VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
+
__atapi_pio_bytes(qc, bytes);
return;
return;
}
- ata_pio_sector(qc);
+ ata_pio_sectors(qc);
}
+
+ ata_altstatus(ap); /* flush */
}
static void ata_pio_error(struct ata_port *ap)
{
struct ata_port *ap = _data;
unsigned long timeout;
- int qc_completed;
+ int has_next;
fsm_start:
timeout = 0;
- qc_completed = 0;
+ has_next = 1;
switch (ap->hsm_task_state) {
- case HSM_ST_IDLE:
- return;
+ case HSM_ST_FIRST:
+ has_next = ata_pio_first_block(ap);
+ break;
case HSM_ST:
ata_pio_block(ap);
break;
case HSM_ST_LAST:
- qc_completed = ata_pio_complete(ap);
+ has_next = ata_pio_complete(ap);
break;
case HSM_ST_POLL:
case HSM_ST_ERR:
ata_pio_error(ap);
return;
+
+ default:
+ BUG();
+ return;
}
if (timeout)
queue_delayed_work(ata_wq, &ap->pio_task, timeout);
- else if (!qc_completed)
+ else if (has_next)
goto fsm_start;
}
printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
ap->id, qc->tf.command, drv_stat, host_stat);
+ ap->hsm_task_state = HSM_ST_IDLE;
+
/* complete taskfile transaction */
qc->err_mask |= ac_err_mask(drv_stat);
ata_qc_complete(qc);
{
struct ata_port *ap = qc->ap;
+ /* Use polling pio if the LLD doesn't handle
+ * interrupt driven pio and atapi CDB interrupt.
+ */
+ if (ap->flags & ATA_FLAG_PIO_POLLING) {
+ switch (qc->tf.protocol) {
+ case ATA_PROT_PIO:
+ case ATA_PROT_ATAPI:
+ case ATA_PROT_ATAPI_NODATA:
+ qc->tf.flags |= ATA_TFLAG_POLLING;
+ break;
+ case ATA_PROT_ATAPI_DMA:
+ if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
+ BUG();
+ break;
+ default:
+ break;
+ }
+ }
+
+ /* select the device */
ata_dev_select(ap, qc->dev->devno, 1, 0);
+ /* start the command */
switch (qc->tf.protocol) {
case ATA_PROT_NODATA:
+ if (qc->tf.flags & ATA_TFLAG_POLLING)
+ ata_qc_set_polling(qc);
+
ata_tf_to_host(ap, &qc->tf);
+ ap->hsm_task_state = HSM_ST_LAST;
+
+ if (qc->tf.flags & ATA_TFLAG_POLLING)
+ queue_work(ata_wq, &ap->pio_task);
+
break;
case ATA_PROT_DMA:
+ assert(!(qc->tf.flags & ATA_TFLAG_POLLING));
+
ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
ap->ops->bmdma_setup(qc); /* set up bmdma */
ap->ops->bmdma_start(qc); /* initiate bmdma */
+ ap->hsm_task_state = HSM_ST_LAST;
break;
- case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
- ata_qc_set_polling(qc);
- ata_tf_to_host(ap, &qc->tf);
- ap->hsm_task_state = HSM_ST;
- queue_work(ata_wq, &ap->pio_task);
- break;
+ case ATA_PROT_PIO:
+ if (qc->tf.flags & ATA_TFLAG_POLLING)
+ ata_qc_set_polling(qc);
- case ATA_PROT_ATAPI:
- ata_qc_set_polling(qc);
ata_tf_to_host(ap, &qc->tf);
- queue_work(ata_wq, &ap->packet_task);
+
+ if (qc->tf.flags & ATA_TFLAG_WRITE) {
+ /* PIO data out protocol */
+ ap->hsm_task_state = HSM_ST_FIRST;
+ queue_work(ata_wq, &ap->pio_task);
+
+ /* always send first data block using
+ * the ata_pio_task() codepath.
+ */
+ } else {
+ /* PIO data in protocol */
+ ap->hsm_task_state = HSM_ST;
+
+ if (qc->tf.flags & ATA_TFLAG_POLLING)
+ queue_work(ata_wq, &ap->pio_task);
+
+ /* if polling, ata_pio_task() handles the rest.
+ * otherwise, interrupt handler takes over from here.
+ */
+ }
+
break;
+ case ATA_PROT_ATAPI:
case ATA_PROT_ATAPI_NODATA:
- ap->flags |= ATA_FLAG_NOINTR;
+ if (qc->tf.flags & ATA_TFLAG_POLLING)
+ ata_qc_set_polling(qc);
+
ata_tf_to_host(ap, &qc->tf);
- queue_work(ata_wq, &ap->packet_task);
+ ap->hsm_task_state = HSM_ST_FIRST;
+
+ /* send cdb by polling if no cdb interrupt */
+ if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
+ (qc->tf.flags & ATA_TFLAG_POLLING))
+ queue_work(ata_wq, &ap->pio_task);
break;
case ATA_PROT_ATAPI_DMA:
- ap->flags |= ATA_FLAG_NOINTR;
+ assert(!(qc->tf.flags & ATA_TFLAG_POLLING));
+
ap->ops->tf_load(ap, &qc->tf); /* load tf registers */
ap->ops->bmdma_setup(qc); /* set up bmdma */
- queue_work(ata_wq, &ap->packet_task);
+ ap->hsm_task_state = HSM_ST_FIRST;
+
+ /* send cdb by polling if no cdb interrupt */
+ if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+ queue_work(ata_wq, &ap->pio_task);
break;
default:
inline unsigned int ata_host_intr (struct ata_port *ap,
struct ata_queued_cmd *qc)
{
- u8 status, host_stat;
+ u8 status, host_stat = 0;
- switch (qc->tf.protocol) {
+ VPRINTK("ata%u: protocol %d task_state %d\n",
+ ap->id, qc->tf.protocol, ap->hsm_task_state);
- case ATA_PROT_DMA:
- case ATA_PROT_ATAPI_DMA:
- case ATA_PROT_ATAPI:
- /* check status of DMA engine */
- host_stat = ap->ops->bmdma_status(ap);
- VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
-
- /* if it's not our irq... */
- if (!(host_stat & ATA_DMA_INTR))
+ /* Check whether we are expecting interrupt in this state */
+ switch (ap->hsm_task_state) {
+ case HSM_ST_FIRST:
+ /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
+ * The flag was turned on only for atapi devices.
+ * No need to check is_atapi_taskfile(&qc->tf) again.
+ */
+ if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
goto idle_irq;
+ break;
+ case HSM_ST_LAST:
+ if (qc->tf.protocol == ATA_PROT_DMA ||
+ qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
+ /* check status of DMA engine */
+ host_stat = ap->ops->bmdma_status(ap);
+ VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
+
+ /* if it's not our irq... */
+ if (!(host_stat & ATA_DMA_INTR))
+ goto idle_irq;
+
+ /* before we do anything else, clear DMA-Start bit */
+ ap->ops->bmdma_stop(qc);
+ }
+ break;
+ case HSM_ST:
+ break;
+ default:
+ goto idle_irq;
+ }
- /* before we do anything else, clear DMA-Start bit */
- ap->ops->bmdma_stop(qc);
+ /* check altstatus */
+ status = ata_altstatus(ap);
+ if (status & ATA_BUSY)
+ goto idle_irq;
- /* fall through */
+ /* check main status, clearing INTRQ */
+ status = ata_chk_status(ap);
+ if (unlikely(status & ATA_BUSY))
+ goto idle_irq;
- case ATA_PROT_ATAPI_NODATA:
- case ATA_PROT_NODATA:
- /* check altstatus */
- status = ata_altstatus(ap);
- if (status & ATA_BUSY)
- goto idle_irq;
+ DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
+ ap->id, qc->tf.protocol, ap->hsm_task_state, status);
- /* check main status, clearing INTRQ */
- status = ata_chk_status(ap);
- if (unlikely(status & ATA_BUSY))
- goto idle_irq;
- DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
- ap->id, qc->tf.protocol, status);
+ /* ack bmdma irq events */
+ ap->ops->irq_clear(ap);
- /* ack bmdma irq events */
- ap->ops->irq_clear(ap);
+ /* check error */
+ if (unlikely((status & ATA_ERR) || (host_stat & ATA_DMA_ERR)))
+ ap->hsm_task_state = HSM_ST_ERR;
+
+fsm_start:
+ switch (ap->hsm_task_state) {
+ case HSM_ST_FIRST:
+ /* Some pre-ATAPI-4 devices assert INTRQ
+ * at this state when ready to receive CDB.
+ */
+
+ /* check device status */
+ if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {
+ /* Wrong status. Let EH handle this */
+ ap->hsm_task_state = HSM_ST_ERR;
+ goto fsm_start;
+ }
+
+ atapi_send_cdb(ap, qc);
+
+ break;
+
+ case HSM_ST:
+ /* complete command or read/write the data register */
+ if (qc->tf.protocol == ATA_PROT_ATAPI) {
+ /* ATAPI PIO protocol */
+ if ((status & ATA_DRQ) == 0) {
+ /* no more data to transfer */
+ ap->hsm_task_state = HSM_ST_LAST;
+ goto fsm_start;
+ }
+
+ atapi_pio_bytes(qc);
+
+ if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
+ /* bad ireason reported by device */
+ goto fsm_start;
+
+ } else {
+ /* ATA PIO protocol */
+ if (unlikely((status & ATA_DRQ) == 0)) {
+ /* handle BSY=0, DRQ=0 as error */
+ ap->hsm_task_state = HSM_ST_ERR;
+ goto fsm_start;
+ }
+
+ ata_pio_sectors(qc);
+
+ if (ap->hsm_task_state == HSM_ST_LAST &&
+ (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
+ /* all data read */
+ ata_altstatus(ap);
+ status = ata_chk_status(ap);
+ goto fsm_start;
+ }
+ }
+
+ ata_altstatus(ap); /* flush */
+ break;
+
+ case HSM_ST_LAST:
+ if (unlikely(status & ATA_DRQ)) {
+ /* handle DRQ=1 as error */
+ ap->hsm_task_state = HSM_ST_ERR;
+ goto fsm_start;
+ }
+
+ /* no more data to transfer */
+ DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
+ ap->id, status);
+
+ ap->hsm_task_state = HSM_ST_IDLE;
/* complete taskfile transaction */
qc->err_mask |= ac_err_mask(status);
ata_qc_complete(qc);
break;
+ case HSM_ST_ERR:
+ printk(KERN_ERR "ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
+ ap->id, status, host_stat);
+
+ ap->hsm_task_state = HSM_ST_IDLE;
+ qc->err_mask |= __ac_err_mask(status);
+ ata_qc_complete(qc);
+ break;
default:
goto idle_irq;
}
ap = host_set->ports[i];
if (ap &&
- !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
+ !(ap->flags & ATA_FLAG_PORT_DISABLED)) {
struct ata_queued_cmd *qc;
qc = ata_qc_from_tag(ap, ap->active_tag);
- if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
+ if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
(qc->flags & ATA_QCFLAG_ACTIVE))
handled |= ata_host_intr(ap, qc);
}
return IRQ_RETVAL(handled);
}
-/**
- * atapi_packet_task - Write CDB bytes to hardware
- * @_data: Port to which ATAPI device is attached.
- *
- * When device has indicated its readiness to accept
- * a CDB, this function is called. Send the CDB.
- * If DMA is to be performed, exit immediately.
- * Otherwise, we are in polling mode, so poll
- * status under operation succeeds or fails.
- *
- * LOCKING:
- * Kernel thread context (may sleep)
- */
-
-static void atapi_packet_task(void *_data)
-{
- struct ata_port *ap = _data;
- struct ata_queued_cmd *qc;
- u8 status;
-
- qc = ata_qc_from_tag(ap, ap->active_tag);
- assert(qc != NULL);
- assert(qc->flags & ATA_QCFLAG_ACTIVE);
-
- /* sleep-wait for BSY to clear */
- DPRINTK("busy wait\n");
- if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
- qc->err_mask |= AC_ERR_ATA_BUS;
- goto err_out;
- }
-
- /* make sure DRQ is set */
- status = ata_chk_status(ap);
- if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
- qc->err_mask |= AC_ERR_ATA_BUS;
- goto err_out;
- }
-
- /* send SCSI cdb */
- DPRINTK("send cdb\n");
- assert(ap->cdb_len >= 12);
-
- if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
- qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
- unsigned long flags;
-
- /* Once we're done issuing command and kicking bmdma,
- * irq handler takes over. To not lose irq, we need
- * to clear NOINTR flag before sending cdb, but
- * interrupt handler shouldn't be invoked before we're
- * finished. Hence, the following locking.
- */
- spin_lock_irqsave(&ap->host_set->lock, flags);
- ap->flags &= ~ATA_FLAG_NOINTR;
- ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
- if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
- ap->ops->bmdma_start(qc); /* initiate bmdma */
- spin_unlock_irqrestore(&ap->host_set->lock, flags);
- } else {
- ata_data_xfer(ap, qc->cdb, ap->cdb_len, 1);
-
- /* PIO commands are handled by polling */
- ap->hsm_task_state = HSM_ST;
- queue_work(ata_wq, &ap->pio_task);
- }
-
- return;
-
-err_out:
- ata_poll_qc_complete(qc);
-}
-
-
/**
* ata_port_start - Set port up for dma.
* @ap: Port to initialize
ap->active_tag = ATA_TAG_POISON;
ap->last_ctl = 0xFF;
- INIT_WORK(&ap->packet_task, atapi_packet_task, ap);
INIT_WORK(&ap->pio_task, ata_pio_task, ap);
for (i = 0; i < ATA_MAX_DEVICES; i++)
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